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多位数的读法和写法,是多位数加、减计算的基础,按照我国四位一级计数的方法,在学过万以内数的读写后,学习把个级数的读写方法类推到万级数的读写,在这个基础上,再类推到亿以上的数的读写。这部分教学的重点是掌握多位数的读写规律,难点是中间有0的数的读写,读比写更难。 多位数的加、减法,是在学生学习了“万以内的加减法”和“多位数的读法和写法”的基础上进行学习的。多位数的加、减法与万以内数加减法的计算方法相同,但数目大,数位多,连续进位、连续退位等情况较复杂,加减法的速算法也较难理解,计算时容易出错。 针对以上情况,教学时,要在制定好教学目标,做好知识迁移,指导学习,加强训练等方面下功夫。
Multi-digit reading and writing is the basis for multi-digit addition and subtraction calculations. According to the four-level counting method in our country, after learning how to read and write in tens of thousands, To the million series of reading and writing, on this basis, and so on analogy to more than the number of literacy. The focus of this part of teaching is to master the law of multi-digit reading and writing, the difficulty is the middle of the number of 0 reading and writing, reading more difficult to write. Multiples of addition and subtraction, is in the students learn the “addition and subtraction within the law” and “multi-digit reading and writing” based on the study. Addition and subtraction of multi-digit numbers is the same as the calculation method of addition and subtraction within thousands, but the number is large, the number of digits is more, continuous carry, continuous abdication and so on are more complicated, and the speed algorithm of addition and subtraction is hard to understand. Wrong. In view of the above, teaching, we should make efforts in formulating teaching objectives, making knowledge transfer, guiding study, and strengthening training.